On the phonon spectra of polysulphurnitride, (SN)x
- 14 January 1977
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 10 (1), L1-L5
- https://doi.org/10.1088/0022-3719/10/1/001
Abstract
A four-parameter valence force model is presented on the basis of a simplified three-dimensional (SN)x structure. It describes reasonably the gross features of the phonon data known up to now. Evidence for non-central interchain forces is found. The model favours a high-frequency cut-off of the optic spectra at 1004 cm-1. Thus it further suggests that only two lines (1004 cm-1, 660 cm-1) out of all experimental Ag frequencies larger than 600 cm-1 are associated with a first-order Raman process. It explains why the intensity of the peak at 660 cm-1 is expected to be much stronger than that of the 1004 cm-1 mode. The importance of internal strain effects in (SN)x is manifested. The phonon dispersion curves calculated along (010) are presented.Keywords
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